One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； January 6th

2017-01-06View Original

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Single-choice question: When a centrifugal pump fails to produce any flow and remains empty, the possible causes include: ① The pump is not filled with liquid at the time of startup; ④ The pump shaft rotates in the reverse direction; ② The suction pipeline is blocked or there is air leakage in the instrumentation; ⑤ Gas gets into the pump; ③ The liquid level in the suction container is too low; ⑥ The check valve leaks. Which of these do you think could be the cause? A. ①, ③, ⑤ B. ②, ④, ⑥ C. None of them D. All of them Answer: D. All of them

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One question per day; those who answer correctly receive 6 wealth points, while participants receive 2 wealth points； January 6th

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